the act of quietly squeezing out a fart when sitting down by leaning to the side slightly and raising one cheek.

My girlfriend always knows when I fart because even though I do the one cheek sneak, I always give it away with my farting facial expression. Not to mention that the room also smells like a fucking animal died in there!

A type of fart that is done while sitting, the one-cheek sneak is done by leaning to the side to let the gas excape. Very handy when sitting on a smooth, hard surface while wearing shorts, to prevent "hovercraft" sounds.

To avoid disrupting the classroom, Johnny let out a one-cheek sneak, and nobody was the wiser.

When recieving oral from your partner, you tell that bitch to close his/her eyes and open his/her mouth (making him/her believe you are about to blow your load) then you turn around and expell vile ass fumes into your partners open mouth.

Yo dude, i gave that bitch from the bar a one cheek sneak she will never forget!

Hey dave, I totally just shit in this girls mouth, she never saw the ol one cheek sneak coming!